Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332



Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem

Women who have been blind since birth almost never have breast cancer. A high level of one specific hormone is though to contribute to their low cancer rate. Which hormone is it and why are levels of this hormone unusually high in the blind?

Summary Introduction

To determine: The hormone which is present in higher amounts in blind women and protects them from breast cancer. Also explain the reason why it is unusually high in the blind.

Concept introduction: Cancer is a state or a condition where cells grow wildly and uninhibitedly. There are many types of cancers and they are one of the leading causes of death found in humans. One of the most deadly cancers in women is breast cancer. Increased secretion of a hormone called melatonin reduces the risk of breast cancer in women.

Some hormones and their level in our body provide a protective effect against breast cancer. Melatonin hormones are produced in the brain by the pineal gland that regulates the sleep and wake cycle in the body. The hormones levels get increased during night and their level gradually decreases when exposed to light. In many westernized and industrialized countries, melanin secretion in the human body diminishes due to increased night-time exposure of artificial light...

Still sussing out bartleby?

Check out a sample textbook solution.

See a sample solution

The Solution to Your Study Problems

Bartleby provides explanations to thousands of textbook problems written by our experts, many with advanced degrees!

Get Started

Additional Science Solutions

Find more solutions based on key concepts

Show solutions add

What behaviors would be most helpful in preventing osteoporosis?

Understanding Nutrition (MindTap Course List)

Name the following compounds: a HCl(g) b HBr(aq) c HF(g) d HNO2(aq)

General Chemistry - Standalone book (MindTap Course List)

The basic building blocks for protein are a. glucose units. b. amino acids. c. side chains. d. saturated bonds.

Nutrition: Concepts and Controversies - Standalone book (MindTap Course List)

In a womens 100-m race, accelerating uniformly, Laura takes 2.00 s and Healan 3.00 s to attain their maximum sp...

Physics for Scientists and Engineers, Technology Update (No access codes included)